Hand brake



Odi. 24, 1933. s. B HASELHNE 1,931,654

HAND BRAKE Filed Feb. 21, 1930 Patented @et 24, 1933 sTATss FiiirCE rATENT HAND BRAKE Stacy E. Haseltine, Chicago, Ill., assignor to W. H. Miner, Inc., Chicago, Ill., a corporation of Delaware This invention relates to improvements in hand brakes.

One object of the invention is to provide a simple and efficient hand brale ymechanism, v in all of the operations necessary to apply e andrei-ease the brakes are effected by a single manually operated member, operation of which in one direction effects tightening or the braises in a reverse direction effects release of the same, and wherein means is provided for holding the brakes in tightened condition, which means automatically rendered operative when the manually operated member is actuated in a ening direction, and is automatically thrown to inoperative position when the manually operated member is actuated in a reverse direction to eilect release of the brakes.

A more specic object of the invention is to vide a hand brake mechanism including a n winding drum and means for rotating the drum in one direction to tighten the brakes and in reverse direction to release the same, together with means. for preventing retrograde rotation of the winding drum, wherein the last named means is withdrawn from operative holdrelation by movement of the rotating means in a direction to unwind the chain from the drum, and is automatically thrown into operative holding relation by movement ofthe rotary means in chain winding direction.l

A further object of the invention is to provide a brake mechanism as speciiied Ain the preceding paragraph, wherein the operations of disengaging the holding means and effecting a operative reengagement thereof with the chain winding means are performed without destroying the operating relation between the means for rotating the drum and the drum.

Another object of the invention is to provide 0 in a Vbrakemechanism of the character indicated vincluding means for preventing retrorotation of the chain Winding drum Wherein all the operations of the brake mechanism are controlled by a single actuating member, and wherein the actuating member is at all times operatively connected with f the chain winding drum, means for preventing accidental operation, through the pull of the brake chain, of the means for preventing rotation of the chain winding drum while the brake mechanism yis being released. l

Other objects of the invention will more clearly appear from the description and claims hereinafter following.

ln the drawing, forming a .part of this speci.-

iication, Figure 1 is a iront elevational View, partly in section, of my improved hand brake mechanism illustrating the same applied to the vertical end wall of a railway car and corresponding tothe line 1 1 of Figure 2. Figure 2 `is a vertical, transverse, sectional View corresponding substantially to the line 2 2 of Figure 1. Figurev 3 is a View of the upper part of the brakemechanism, the View being a section similar to Figure 1 but showingv the parts in a diiferent position. And Figure 4 is a detailed, vertical, sectional view through the locking dog, latching cam and operating shaft of my improved hand brake mechanism., similar to Figure` 3 but illustrating the parts in a slightly different position, andwith the teeth of the gear D omitted.

In said drawing, l() designates the end wall of a railway car on which my improved hand brake mechanism is mounted. The operating parts of the brake mechanism are preferably contained in a housing secured to said end wall. As shown in Figures 1 and 2, the housing comprises a rear section. 11 in the form of a plate member, and a front section 12 in the form of a cover. The rear section 11 is of generally rectangular outline and has an inwardly offset wall portion 112, which is spaced from the end wall 10 of the car. The cover section 12 of the housing has lateral flange members 13-13 and an upstanding top lug member 14 by which the same is secured to the section 11. The two sections are secured together by a plurality of rivets 15-15 extending through the flange sections 13 and the lug 14 of the cover member 12, and through the corresponding portions of the rear section 11. The rivets 15 at the-top and bottom of the housing are preferably also employed to secure the housing to the end wall 10 of the car and extend through said end wall, as clearly shown in Figure 2. The housing section 12 is open at the bottom, as indicated at 16, to accommodate the brake chain 17, which is connected to the operating parts of the brake mechanism proper of the railway car, not shown. The section 12 of the housing has a topv wall 18 and side walls 19-19. At the top, the housing section 12 is provided with a vertically disposed front wall 20 spaced from the section 11, which forms the back wall of the housing, a suiiicient distance to accommodate certain of the operating parts of the hand brake mechanism. Below the wall portion 20, the outer` wall of the section 12 is Aoutwardly offset, as indicated at 21 and clearly shown in Figures 1 and 2, to provide an enlarged f chamber portion to accommodate the chain winding drum of the brake mechanism.

My improved hand brake mechanism proper comprises broadly a chain winding drum A; a gear B fixed to the drum; a rotary operating shaft C, which is guided for limited reciprocating movement; a pinion D fixed to the operating shaft; a hand wheel E; a locking dog F for preventing retrograde rotation of the chain winding drum; and a latching cam G.

The chain winding drum A is supported for rotation on a shaft 22 having its opposite ends supported in openings 23 and 24 provided in the front and rear walls of the housing, respectively. As clearly shown in Figure 2, both of these openings are suitably reinforced to strengthen the support for the shaft. The chain winding drum is of substantially conical form and has a helical winding groove 123 thereon. The inner end of the brake chain 17 is connected to the winding drum A by means of a retaining pin, 124 extending through the end link of the chain and alined openings in the chain winding drum. The end link of the chain is accommodated in a suitable recess 25 provided in that portion of the drum which is of largest diameter. The gear B, which is of considerably larger diameter than the winding drum A is formed integral therewith and is disposed on the inner side of said drum. As shown in Figure 2, the locking pin 124, which serves to secure the chain to the drum also extends through the gear B. In order to prevent rotation of the supporting shaft 22, the outer end of the same is cut away at one side to provide a flattened portion 26 which engages a similar flattened wall portion of the opening 23.

The operating shaft C extends through the upper part of the housing, and is accommodated for reciprocating movement transversely of said housing within alined guideways or openings 27 and 28 provided in the front and rear walls of the housing, respectively. The shaft C is provided with a head 29 at the inner end thereof which is accommodated between the offset wall portion 112 of the rear section of the housing and the end wall 10 of the car. The shaft C is out away at one side as clearly shown in Figures 1, 3 and 4 to provide a flattened portion 30. At the outer end, the shaft C carries the hand wheel E, which is fixed to the same, the hub of the hand wheel being provided with an opening of a cross section corresponding to that of the shaft to fit the same.f The hand wheel E is secured by the usual locking nut 31 provided at the outer end of the shaft C. The hub section. of the hand wheel E fits between the top and bottom walls of the guideway 27 of the front wall of the housing and serves as the bearing member forrotatably supporting the front end of the shaft C. At the outer end the hub of the hand wheel E, that is where the hub connects with the spokes thereof, the same is enlarged so to provide an annular flange-like portion of such a size as to overlap and close slot 32 in ali. operative positions of the hand wheel to prevent entry of foreign matter.

The pinion D is mounted on the shaft C between the head 29 thereof and the hub portion of the hand wheel E. As shown, the' pinion D provided with laterally extending hub-sections 32 and 33 on opposite sides thereof, which sections correspond in diameter to the diameter of the hub portion of the hand wheel E. The teeth of the pinion D are located between the two hub sections, the hub section 33 being accommodated for rotation between the top and bottom walls of the guide slot 28 in the rear section 11 of the housing. The slots 2'? and 28 are so located with respect to the gear B, that the pinionD will at all times mesh with the teeth of the gear B while the pinion is guided for reciprocating movement.

The locking dog F is pivotally supported by means of a pin 34 at a point above the pinion D. As shown, the locking dog F `has a section 35 disposed above the pinion and a depending portion 36 at the cuter end thereof extending past the pinion and having a tooth 37 at the extremity thereof cooperating with the teeth 0f the gear B in order to prevent retrograde rotation of the chain winding drum. The locking dog F is provided with a pair of spaced flanges 33-38 at the inner side of the sections 35 and 36, said iianges 38--38 Yspanning the gear teeth of the pinion D and being adapted to be engaged by the hub sections 32 and 33 at opposite sides of said pinion.

The locking cam G is in the form of a casting l pivotally supported by a pivot pin 39 immediately below the pivot 34 of the locking dog F. This latching cam G has spaced flanges 40-40 at the lower sidethereof, as viewed in Figure 1, the flanges extending upwardly along the lefthand side of said member, as viewed in said figure. The flanges 40-40 are spaced apart such a distance as to span the teeth of the pinion D and gear B and are adapted to be engaged by the hub portions 32 and 33 of said pinion. The flange sections 40-40 of the member G form cam members cooperating with the hub portions of the pinion. As most clearly illustrated in Figure 1,'the combined latching and cam member G is cut away at the inner side immediately above the pivot member thereof, as indicated at 41,' to accommodate the pivot portion of the locking dog F. Immediately adjacent the cut away portion 41, the flanges 40-46 of the member G are provided with a downwardly inclined cam portion 42, as seen in Figure 1, which when said member G is rotated in a righthand direction, as viewed in Figure 1, will engage beneath the pivoted portion of the dog F to cam the same upwardly,` as hereinafter more clearly pointed out. Immediately adjacent the cam portions 42-42, the anges 4i) are provided with substantially vertical portions 43-43 which are notched, ,asindicated Aat 44, to conform to the hub portions` 32-f33 of the pinionv D, and have -the hub portions seated therein,`when the parts are in the position as shown in Figure 1. immediately beneath the cam portions ifi- 44, the flange members 40-40 are provided with inclined cam faces 45-45 which are adapted to engage the hub sections 32-33 of the pinion D, when the pinion is in the extreme lefthand position, as shown in Figures 3 and 4, As will be evident, due to the Weighted portion of the combined loclringand member G being located above the pivotal Aaxis of said member, the normal tendency is for the member G to swing downwardly about said pivot.

The operation of my improved hand brake mechanism is as follows: In tightening or apply-- ing the brakes, assuming the parts to be in the position shown in Figure 1, the hand wheel E is rotated in a clockwise direction, thereby effecting rotation of the pinion D in a similar irection, the pinion intermeshing with the gear lio ^B eecting rotation of the latter and the chain vthe operating shaft C is actuated in a clockwise direction, the pinion D willvbe held at the righthand ends of the guide slots 27 and 28, as viewed in Figure l. .At time, the cam portions 4a ci the memberY G are engaged by the hub sections of the pinion, thereby mantaining the member G in the position illustrated in Figure 1.

When it isv desired to release thebrakes, the operator rotates the hand wheel E in a contraclockwise direction. inasmuch as the gear B is locked against rotation in a clockwise direction by the locking dog F, the pinion D will be forced to travel along the gear teeth of the gear B toward the lett, as viewed in Figure l to the position shown in Figure 3. During this movement of the pinion, the hub portions 'tbeeoi by engagement with the flanges 3S38 the dog out of engagement with the of the gear, as shown in Figure 3. As will be evident, during the movement o the pinion from the position shown inFigure i to that in Figure 3, the same is moved away from the combined latching and cam member G, and the latter isyiree and is urged by gravitation to swing about s pivot in a clockwise direction, as viewed in Fi:u e l, following the movement oi the pinion until it reaches a position where the cani faces 4:2-42 thereorn come intraoperative engagement with the bottom edge oi' the section oi the dog F, whereby movement oi the member G is somewhat retarded. [it this time, the cam races L5m-i5 of the member G are in such a position as to engage the huby sections of the pi, n and form stop means to limit movement thereofI to the right, as viewed in Figure 3. At the i tant the dog is freed from engagement with the gear 3, as shown in Figure 3, the cam member G, which is in engagement with the bottom edge of theseotion 35 of the dog, by ther swinging movement thereof in a clockwise ction, 'lifts the. to further with it so as to completely clear the teeth oi the gear -et the same time, the pull of the brake chain on the winding drum, through the gear B, will effect displacement lof the pinion to the right as viewed in Figure 3 until arrested bythe stop races i5-45 oi the cam G, as shown Figure 4, and due to the pull'oi the chain the pinion will be held in a position the cani surfaces In order to limit the upward swinging movement ci the dog, a stop member 5o preferably provided, the in the form of a transverse rib on the housing.v Further rotation of pinion D in a contra-clockwise direction 'through voporation oi the handwheel will effect rotation of the gear i3 in a clockwise direotion so to unwind the chain, the pinon D be' maintained in the position shown ure e by engagement oi the hub 'portions thereof with the stop or cam races i5-4.15 of the inember G, as hereinbefore pointed out. Unwinding or" the chain may thus be controlled by the hand wheel, thereby permitting the brakeman to back ,member G from the position ofi the brakes inthe usual manner. In this conm nection, it is pointed out that due to frictional engagement between the hub of the pinion and the faeces i5-45 oi the cam G, the tendency will be to rotate the latter in a clockwise v irection, therebytending to liit the dog maintain the saine in engagement with the stop member 5G. rlhe cam member G will thus be maintained. in holding position, while pinion rotated in a contra-clockwise direction. When it desired to completely release the brakes the hand wheel is released by the operator immediately after the dog F has been thrown out of engagement with the teeth of the gear B and the chain permittea to unwind through the pull thereoi. Rotation of the gear B during this aetion will cause rotation oi the pinion in a contra-clockwise direction, as viewed in Figures 3 i and inasmuch as the hub members oi the pinion are in frictional engagement with the surfaces Ll5-fi5 oi the member the tendency of such frictional contact will be to rotate the member G in a clockwise direction, thereby maintaining thesurfaces fio fio thereof engaged with the hub portions oi the pinion and holding the pinion in vthe position shown in Figure fl.

In again applying the brakes after the parts have been left in the positions shown in Figures 3 and 4, the hand 'wheel E is rotated in a oloc rwise direction, thereby rotating the pinion D in a clockwise direction also. Due to the frietional engager rent between the pinion, hub sections and the surfaces (i5-i5 of the member the tendency will be to rotate the member G- in a contra-clockwise direction about its pivot, thereby bringing the cam sui-Traces ail-Jill opposite the hub sections ofthe pinion and permitting movement of the pinion to the as viewed in Figure 3, through engagement oi thereof with the teeth of the B. The torce exerted by engagement of the teeth of the pinion with the teeth or the gear B also aids in swinging the member G back to the position shown in Figure i by forcing pinion to travel to lshown in Figure l, the dog is in full engagement with the teeth of the gear n-,

ISS-38,01? the dogare entirely clear oi 'he sections oi the pinion, thereby permitting free oscillating movement of the dog to allow its ratcheting action in connectionwith the teeth of the gear B. As will be evident, swinging movement or the coi latchii g and to thatshown in Figure yl, will free the surfaces i2- 42 from the dog so as to per-mit the downward swinging movement thereof. Movement to the right of the hub sections thereof with the notched i4 oi the faces 4.3 of the meribo" further rotation oi the operat -it C and the pinion D will cause rotation or the B in a contra-clockv-.fise direction, as viewed in Figure Y.;

eeth

shown Figure 3,

ion, as viewed inv Figure l, is nally limited by engagement of the that I' have provided an exceedingly simple and eiicient hand brake mechanism, wherein all the operations necessary to tighten and release the brakes are performed by rotation of the hand Wheel in the proper direction, operation of the 5 hand wheel in a direction to unwind the chain also releasing the locking dog of the brake mechanism so as to permit free running of the chain Winding drum, and rotation o1" the hand Wheel in a chain tightening direction restoring said dog to operative position to hold the chain winding drum against movement in an unwinding direction.

I have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merely illustrative and I contemplate all changes and modifications that come within the scope of the claims appended hereto.

I claim:

1. In a hand brake mechanism for railway cars, the combination with a chain tightening member operative in one direction to effect tightening of the brakes and in a reverse direction to effect release of the brakes; of means operatively connected to said tightening member for actuatingY the same; a locking dog for holding said tightening member against movement in releasing direction, said actuating means being bodily displaceable with respect to the dog to engage and actuate said clog to released position; and means for guiding said actuating means for limited bodily movement, operation of said actuating means in a direction to release the brakes eiecting bodily movement in one direction thereof and actuating the dog to withdraw the same from operative engagement, and operation of said means in a direction to tighten the brakes eiecting bodily displacement of the actuating means to said limited extent a direction to free said dog and effect return thereof to holding position.

2. In a hand brake mechanism, the combination with a rotary chain winding member; of rotary means for actuating said winding member, said rotary means and rotary member being bodily displaceable with respect to each other while operatively engaged; a locking dog cooperating with said winding member for preventing retrograde rotation thereof, bodily displacement in one direction of said rotary means displacing the dog by engagement therewith to disengage the same from said winding member and bodily displacement thereof in a reverse direction eirecting return of the dog to operative position.

3. In a hand brake mechanism, the combination With a rotary chain Winding member; of rotary means for actuating said winding member, said rotary means-being bodily displaceable to a limited extent with respect to the rotary member while in operative engagement therewith, said rotary member being bodily displaceable in one direction when actuated in a direction to effect unwinding of the chain and r l bodily displaceable in a reverse direction when actuated in a direction to effect winding of the chain; a locking dog cooperating with said winding member to hold the same against rotation in an unwinding direction, said dog being actuated by said rotary actuating means and disengaged from said Winding member by bodily displacement of the actuating means in said first named direction and reengagement of the dog with the winding means being effected by bodily displacement of said rotary means in said second named direction.

4. In a hand brake mechanism, the combinationV With a chain winding drum; of a driving gear operatively connected to said drum; a pinion for actuating said gear; guide means for guiding said pinion for limited bodily movement with respect to said gear, whilein operative engagement therewith; a locking dog cooperating with said drum for preventing retrograde rotation thereof, rotation of said pinion in a direction to unwind the chain effecting bodily displacement o the pinion by engagement with the teeth of the gear in a direction to engage said dog and withdraw the same from operative relation to the chain winding drum, and rotation of said pinion in a chain winding direction effecting displacement thereof in a reverse direction, thereby releasing said dog and effecting restoration thereof to operative position, and also effecting return of the pinion to operative position to produce rotation or" the winding drum in chain winding direction.

5. In a hand brake mechanism, the combination with a chain Winding drum; oi a gear operatively connected to the drum; amanually actuated rotary operating member; a locking .dog for preventing retrograde rotation of said drum; a pinion iiXed to said operating member and engaged with said gear; guide means for said rotary operating means for guiding the same for bodily movement with respect to said drum, said pinion and operating member being bodily displaced one direction by the cooperating gear teeth oi the pinion and gear to engage and aotuate said dog, when said operating member is rotated in a direction to effec unwinding of the chain, and being bodily displaceable in a reverse dii ection when rotated in a direction to wind the chain, Vdisplacement in said iirst named direction retraoting the dog from operative holding engagement with respect to the drum and maintaining the dog inV said condition, and displacement in said second named direction effecting return oi the dog to operative position, and further rotation oi said pinion effecting operation oi said drum in a chain winding direction.

6. In a hand brake mechanism, the combination with a rotary chain winding meiber; ci a gear iixed to said member; a locking dog cooperating with said member for holding the same against movement in chain unwindingdirection, said dog being retractable from holding position; means for retracting said dog and retaining the same in retracted position, said means being bodily reciprocable to actuate said dog to retract the same and also restore it to operative position, said means including a rotatable pinion meshing with said gear for reciprocating said means; and stop means for liLA iting reciprocating movement of said means, whereby further rotation of the pinion causes rotation of the chain winding means.

7. In a hand brake for railway cars, the combination with a movable chain tightening meinber; oi a locking dog cooperating with said member for holding the same against movement in chain releasing direction, said dog being retractable from holding position; rotary means which is also bodily reciprocable, said means being in one direction for retracting said dog and retaining the same in retracted position, and movable in a reverse direction for restoring the dog to operative position, said movable means 8. In a 'hand brake for railway cars, the combination with a rotary chain winding drumaof a gear loperatively connected to said drumjrrotatable actuating meansl including a pipi means for guiding said pinion ior bodily recip-y bination with a rotary chain v riding drum; oi a gear operatively connected said drum' rotatable actuating means including a roca locking dog cooperating with w for preventing retrograde rotation thereof, s dog being retracted by reciprocating nl. vem of said pinion; and gravity actuated means for holding pinion in position to maintain said dog retracted;

lo. in a brake ier railway cars, combination with a rota;y chain winding drum; oi gear operatively connected said r tatable actua. ing means including a pinion; means for gniding said pinion for bodily reciprocating cient with respect to '.d gear; a locking dog cooperating with said windng dr rn :for pre enting retrograde rotation thereof, dog being retracted by reciprocati' movement of said pinion; and means rendered oorative by reci ocation of said pinionior moving dog to fully retracted position.

ll.. in a hand brake railway cars, 'the combination with a rotary chain winding drum; of a gear operatively connected to said dr m;

rotatable actua f means for guid roca' nt with spect to said loclnng dogcooperating n th said winding dr for preventing retrograde rotation tio dog of said pinion; and means rendered e by recii rocation of said pinion for moving said dog to inlly retracted position and latching pinion against return reciprocating movement while said dog is retracted.

l2. in a hand for railway cars, the comti^n with a rotary chain winding drum; of

connected to d drum; romeans including a pinion; said pinion for bodily recipent with peet to saidgear; a 'Peking f cooperating with said wind-ing drum preventing ret ade rotationtheeof, said dos: bein "etracted by reciprocating'movement od means rendered operative by said Y' non for moving dog and latching said ping movement while nion and last named en@ gement with each other,

ing movement with respect to sa' i a ing kdrum to wind the ciain from latching relation with respect to said pinion.

chain winding drum; of o drum and rotatable thereing retrograde rotation of saidwinding drum,

being retracted by reciprocating inet/errent with; aV rotary operating shaft; a pinion fired to said shaft and rotatable therewith; guide means for guiding said shaft for bodily movement with respect to said gear; a locking dog for preventsaid dog being retractable from operative holding engagement with respect to said drum, said pinion through its engagement with the gear being moved along said guide means in one direction `when rotated in chain winding direction andl in reverse direction 'when rotated in lun- ,""nding direction, and engaging said dog when ved in said last named direction to withdraw from hol ng position, movement of ion said :drst named direction effectn ci e dog to holding position.

a `hand bra'I e -for railway cars, the comwitli a rc ry chain winding drum; oi 1 to said drum and rotatable therewith; a rotary operating shaft; a pinion fixed to said shaft and rotatable therewith; guide means for guiding said shaft for bodily movement with respect to said gear; a locking dog for preventing retrograde rotation of said winding drum, said dog being retractable from operative holding engagement with respect to said drum, said shaft being reciprocated in said guide means upon rotation thereoic in reverse directions through engagement of the vpinion with said gear, said dog having cani means thereon cooperating with means on the pinion whereby the dog is actuated to be retracted from said gear when said shaft is reciprocated.

l5. in a hand brake for railway cars, the combination with a rotary chain winding drum; of a gear iiiied to said drum; a pinion meshing with said gear; a rotatable operating means including a shait carrying said pinion; means for guiding said operating shaft for reciprocating movement; a gravity actuated locking dog for holding said drum against retrograde rotation, said dog being retractable from said holding position, said dog being engaged by said operating means and retracted upon movement of the latter in one direction along guide rie-ans; Aand a pivoted la'tching member controlled by the reciprocation and rotation of the operating means for latching the latter in position to hold said dog retracted.

16. in a hand brake for railway cars, the combination with a rotary chain winding drum; of a gear iiXed to said drum; a pinion meshing with aid gear; a rotatable operating means includ- 'ng a shaft carrying said pinion; means for guiding said operating shaft for reciprocating move- 3@ ment; a gravity actuated locking dog for holding said drum against retrograde rotation, d dog being retractable from said holding position, said dog being engaged by operating .leans and retracted upon displacement of the latter in 135 one direction; and a pivoted latching member controlled by the reciprocation and rotation of the operating means for latching the latter in displaced position, said latching member having cani means thereon cooperating with said 140 dog to effect complete retraction of the same from said holding position.

17. in a hand brake for railway cars, the combination with a rotary chain winding drum; of a gear lise to said drum; a pinion meshing with said gear; a rotatable operating means including a shaft carrying said pinion; means for guiding said operating shaft for reciprocating movement; a gravity actuated locking dog for holding said drum against retrograde rotation, 150.

said dog being retractable from said holding position, said dog being engaged by said operating means and retracted upon displacement of the latter in one direction; and a pivoted latching member controlled by the reciprocation and rotation of the operating means for latching the latter in said displaced position, said latching member having cam means thereon cooperating with said dog to effect complete retraction of the same from said holding position, said rotatable operating means and latching member having camming engagement with each other for eiecting restoration of said latch member when said operating means is rotated in chain Winding direction.

18. In a hand brake mechanism, the combination With a rotary chain-Winding element; of

releasable holding means for preventing rotation of said element in unwinding direction; a drivinggear operatively connected to said element; a rotary pinion constantly meshing With vsaid gear and-rotatable in one direction While lli) 

